L-band (3.5 mu m) IR-excess in massive star formation - II. RCW 57/NGC 3576 Maercker, M en_US Burton, Michael en_US Wright, Christopher en_US 2021-11-25T12:56:32Z 2021-11-25T12:56:32Z 2006 en_US
dc.description.abstract Context. We present a JHK(s)L survey of the massive star forming region RCW 57 (NGC 3576) based on L-band data at 3.5 mu m taken with SPIREX ( South Pole Infrared Explorer), and 2MASS JHK(s) data at 1.25-2.2 mu m. This is the second of two papers, the first one concerning a similar JHK(s)L survey of 30 Doradus. Aims. Colour-colour and colour-magnitude diagrams are used to detect sources with infrared excess. This excess emission is interpreted as coming from circumstellar disks, and hence gives the cluster disk fraction (CDF). Based on the CDF and the age of RCW 57, it is possible to draw conclusions on the formation and early evolution of massive stars. Methods. The infrared excess is detected by comparing the locations of sources in JHKsL colour-colour and L vs. (K-s - L) colour - magnitude diagrams to the reddening band due to interstellar extinction. Results. A total of 251 sources were detected. More than 50% of the 209 sources included in the diagrams have an infrared excess. Conclusions. Comparison with other JHKsL surveys, including the results on 30 Doradus from the first paper, support a very high initial disk fraction (> 80%) even for massive stars, although there is an indication of a possible faster evolution of circumstellar disks around high mass stars. 33 sources only found in the L-band indicate the presence of heavily embedded, massive Class I protostars. We also report the detection of diffuse PAHs emission throughout the RCW 57 region. en_US
dc.identifier.issn 0004-6361 en_US
dc.language English
dc.language.iso EN en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri en_US
dc.source Legacy MARC en_US
dc.subject.other stars : circumstellar matter en_US
dc.subject.other stars : formation en_US
dc.subject.other stars : evolution en_US
dc.subject.other stars : Hertzsprung-Russell (HR) and C-M diagrams stars : planetary en_US
dc.subject.other systems : protoplanetary disks en_US
dc.subject.other stars : pre-main sequence en_US
dc.title L-band (3.5 mu m) IR-excess in massive star formation - II. RCW 57/NGC 3576 en_US
dc.type Journal Article en
dcterms.accessRights open access
dspace.entity.type Publication en_US
unsw.description.notePublic The journal of Astronomy & Astrophysics is published by EDP Sciences, en_US
unsw.description.publisherStatement © The European Southern Observatory (ESO) en_US
unsw.relation.faculty Science
unsw.relation.faculty UNSW Canberra
unsw.relation.ispartofissue 1 en_US
unsw.relation.ispartofjournal Astronomy & Astrophysics en_US
unsw.relation.ispartofpagefrompageto 253-263 en_US
unsw.relation.ispartofvolume 450 en_US
unsw.relation.originalPublicationAffiliation Maercker, M en_US
unsw.relation.originalPublicationAffiliation Burton, Michael, Physics, Faculty of Science, UNSW en_US
unsw.relation.originalPublicationAffiliation Wright, Christopher, Physical, Environmental & Mathematical Sciences, Australian Defence Force Academy, UNSW en_US School of Physics * School of Science *
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